Answer: 85
Step-by-step explanation: 15 × 6= 90 - 5= 85
Answer:
The perimeter of rectangle is ![18\ cm](https://tex.z-dn.net/?f=18%5C%20cm)
Step-by-step explanation:
Let
x-----> the length of the rectangle
y----> the width of the rectangle
we know that
----> equation A
---> equation B (area of the constructed figure)
substitute the equation A in equation B
![120=(y+5)y+2(y+5)^{2}+2y^{2}](https://tex.z-dn.net/?f=120%3D%28y%2B5%29y%2B2%28y%2B5%29%5E%7B2%7D%2B2y%5E%7B2%7D)
![120=(y+5)y+2(y+5)^{2}+2y^{2}\\ 120=y^{2}+5y+2(y^{2}+10y+25)+2y^{2}\\ 120=y^{2}+5y+2y^{2}+20y+50+2y^{2}\\120=5y^{2}+25y+50\\5y^{2}+25y-70=0](https://tex.z-dn.net/?f=120%3D%28y%2B5%29y%2B2%28y%2B5%29%5E%7B2%7D%2B2y%5E%7B2%7D%5C%5C%20120%3Dy%5E%7B2%7D%2B5y%2B2%28y%5E%7B2%7D%2B10y%2B25%29%2B2y%5E%7B2%7D%5C%5C%20120%3Dy%5E%7B2%7D%2B5y%2B2y%5E%7B2%7D%2B20y%2B50%2B2y%5E%7B2%7D%5C%5C120%3D5y%5E%7B2%7D%2B25y%2B50%5C%5C5y%5E%7B2%7D%2B25y-70%3D0)
using a graphing calculator -----> solve the quadratic equation
The solution is
![y=2\ cm](https://tex.z-dn.net/?f=y%3D2%5C%20cm)
Find the value of x
![x=y+5 ----> x=2+5=7\ cm](https://tex.z-dn.net/?f=x%3Dy%2B5%20----%3E%20x%3D2%2B5%3D7%5C%20cm)
Find the perimeter of rectangle
![P=2(x+y)=2(7+2)=18\ cm](https://tex.z-dn.net/?f=P%3D2%28x%2By%29%3D2%287%2B2%29%3D18%5C%20cm)
Answer: x<−6
Step-by-step explanation:
Answer:
OB
because it is the correct answer